EP2313958A2 - Rotor interieur pour machine electrique tournante a cales d'aimants en forme de<<t>> - Google Patents
Rotor interieur pour machine electrique tournante a cales d'aimants en forme de<<t>>Info
- Publication number
- EP2313958A2 EP2313958A2 EP09777487A EP09777487A EP2313958A2 EP 2313958 A2 EP2313958 A2 EP 2313958A2 EP 09777487 A EP09777487 A EP 09777487A EP 09777487 A EP09777487 A EP 09777487A EP 2313958 A2 EP2313958 A2 EP 2313958A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- wedges
- shaft
- pole pieces
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
Definitions
- the invention relates to rotating electrical machines whose rotor comprises permanent magnets. More specifically, the invention relates to machines in which the magnets are disposed in recesses of the rotor.
- the electrical machines in question are commonly referred to by the term "buried magnets". This principle of rotor arrangement is widely applied for autopiloted synchronous machines with flux concentration.
- the sizing of a rotating electrical machine depends on its nominal torque. The higher the torque that a motor is capable of delivering, the larger the electric motor, all other things being equal. However, there are applications for which it is desirable to achieve both significant power and great compactness of the engine. To give just a concrete example, when it is desired to install electric traction motors in the wheels of motor vehicles, it is desirable to be able to develop powers of at least 10 kW per motor, and even for the most part at least 25 kW. or 30 kW per motor, for as little weight as possible to limit unsprung masses as much as possible. It is also desirable that the size is also very small, exceeding as little as possible the interior volume of the wheel so as not to interfere with the vehicle elements during suspension travel and during other types of movement of the wheel relative at the vehicle's cash desk.
- An object of the invention is to provide an improved rotor, particularly as regards its resistance to centrifugal forces and thus its dimensional stability.
- the invention thus relates to a buried magnet internal rotor for a rotating electrical machine, the rotor comprising: "a shaft,
- a plurality of pole pieces made of magnetic material and surrounding the shaft, the pole pieces delimiting between them housing,
- a plurality of permanent magnets arranged in the housings,
- a lateral flange axially on each side of the pole pieces along the shaft, the shaft passing through each lateral flange
- the housings are radially closed by wedges cooperating with longitudinal grooves of the pole pieces, said rotor being characterized in that the wedges have a "T" profile, the radial bearing faces of the wedges in the pole pieces being perpendicular to the central radius of the housing, and in that, the wedges extending axially beyond the pole pieces, their ends are refined and folded in a peripheral groove of each side flange.
- the wedges are substantially flush with the surface of the rotor.
- the radially outer surface of the wedges is curved to extend the radially outer curvature of the surface of the pole pieces. More preferably, the ends of the wedges are in contact with the outer walls of the peripheral grooves of each side flange.
- each lateral flange (5, 5 ') are inclined relative to the axial direction by an angle substantially less than 90 °.
- the invention also relates to a rotating electrical machine comprising such a rotor.
- Figure 1 is a sectional view along the axis of a rotor according to the following invention a broken line AA visible in Figures 2 and 3.
- FIG. 2 is a partial sectional view perpendicular to the axis of the rotor of FIG. 1 along a line B-B visible in FIG.
- FIG. 3 is a sectional view perpendicular to the axis of the rotor of FIG. 1 along a line C-C visible in FIG.
- Figure 4 is a perspective view of the shaft 2.
- Figure 5a is a perspective view of a section along the axis of the rotor of the embodiment of the flanges and wedges of magnets.
- Figure 5b is a detailed sectional view along the rotor axis of the folded end of a magnet wedge in the peripheral groove of a side flange.
- FIG. 6 is a view similar to FIG. 1 of a second embodiment of the rotor according to the invention.
- FIG. 7 is a view on a very large scale and in perspective showing a pole piece sheet and a first embodiment of the magnet block according to the invention.
- FIGS. 8 to 10 are views similar to FIG. 7 showing other embodiments of wedges according to the invention.
- a rotor 1 for a hexa-polar machine further comprising a not shown stator.
- the rotor 1 comprises a one-piece shaft 2 resting on bearings 20.
- Six pole pieces 30 are seen, preferably formed by a stack of ferro-magnetic sheets 3.
- Each sheet 3 is substantially perpendicular to the axis of the shaft.
- the sheets may have a very small thickness, for example of the order of a few tenths of millimeter, for example 0.2 mm. Note in passing that the invention is also useful in the case of massive polar parts (non-laminated).
- each lateral flange and optionally each intermediate flange 7 has a central opening.
- the shape of the central opening of the lateral flanges is circular while that of the central opening of the intermediate flanges is adjusted to that of the shaft 2, ie here grooved.
- a tie rod 6 passes through the stack of sheets 3, where appropriate or the intermediate flanges, and allows to enclose the whole between the side flanges 5 and 5 '.
- the centrifugal forces experienced by the pole pieces are therefore taken up by the side flanges and if necessary by the intermediate flanges to the exclusion of any other means.
- the shaft 2 further comprises here an inner shoulder 22 intended to cooperate with a first lateral flange 5 to determine its axial position and therefore the axial position of the pole pieces on the shaft (see in particular Figures 1, 4 , 5a and 6).
- the shoulder 22 of the shaft preferably bears at the bottom of a countersink 50 of the flange.
- An outer ring 26 secured to the shaft for example by radial shrinking immobilizes the flange by pressing axially against the shoulder of the shaft.
- the second flange which can be described as "floating" does not come to rest on a shoulder of the shaft, it remains on the contrary free to move axially at the discretion of the thermal expansion of the stack.
- This floating flange may comprise a countersink substantially identical to that of the blocked flange or be on the contrary reamed throughout its thickness as shown here (see bore 50 'of the second flange).
- the longitudinal faces 300 of the pole pieces 30 each comprise a groove 31 parallel to the axis of the rotor, hollowed at a radial level close to the outer edge 32 of each pole piece 30 (and therefore of each sheet 3), said pole pieces also having a height (or more exactly a radial dimension) slightly greater than the height of the magnets 4.
- Each wedge 51 thus bears on two grooves 31 disposed on each of the adjacent pole pieces.
- the magnets 4 are thus made mechanically integral with the pole pieces 30.
- the essential function of each groove 31 is to form a shoulder to oppose the centrifugation of the wedges and magnets.
- the pole pieces themselves are integral with each other thanks to the tie rods and side plates and possibly intermediate (s).
- the wedges 51 are shaped “T".
- the "T” is reversed if one looks at a shim placed at the top of the rotor ( Figures 2 and 7 to 10).
- the wings of the "T” and the grooves 31 have radial bearing surfaces (respectively 54 and 33) flat, that is to say perpendicular to the central radius 41 of the housing 40. This is particularly clearly seen in FIG. profile wedges 51 and grooves 31 on the one hand allows the rotor to resist centrifugation without generating on this occasion effort tending to expand the housing 40.
- the radial portion (the foot) of the "T" fills the other space between the pole pieces which gives the rotor a substantially smooth outer surface (even in the absence of grinding) because the radially outer surface 53 of the wedge is flush with the outer surface 32 of the pole pieces.
- the corners of the grooves 31 and the edges of the wedges 51 are preferably rounded, for example with a radius of about 0.5 mm, to limit the stress concentrations.
- the top of the wedge 53 can even, as shown in Figure 8, be slightly curved (preferably by adopting the same radius as the outer surface of the rotor) to extend exactly the curvature of the outer edge 32 of the sheets. In this way, high speed rotation causes even less acoustic vibrations (noise).
- Figure 10 shows yet another embodiment in which the radial portion of the "T", after a portion of constant width, flares outwardly of the rotor.
- the ends 51 1 of the wedges 51 extend axially on both sides beyond the pole pieces in notches of the side plates.
- the ends 511 are folded into a peripheral groove 52 of the lateral flanges in order to be axially immobilized therein. This arrangement has also proved favorable in terms of acoustic vibrations (noise) when the rotor is rotating at high speed.
- the ends 511 of the shims are preferably refined by not having the radial portion of the "T" profile.
- the ends 51 1 are then in the form of tabs.
- the outer wall 521 of the peripheral grooves 52 is inclined relative to the axial direction by an angle substantially less than 90 °, for example of the order of 70 ° to create an axial clamping of the wedges when they are folded.
- the pole pieces 30 comprise a pin adapted to cooperate with a groove 21 of the shaft 2. It is this connection which ensures the direct transmission of torque from the pole pieces to the shaft.
- the grooves 21 are preferably parallel-walled and cooperate with tenons bearing faces also parallel.
- the pole pieces preferably consist of a stack of ferro-magnetic sheets 3, each sheet has a substantially rectangular radial projection 34 which constitutes a portion of the tenon.
- the shaft preferably has as many grooves as poles (here six in number) but it is understood that depending on the efforts involved, we could be limited to only 4, 3 or even 2 grooves.
- the shoulder (s) 22 preferably correspond to the ends of the grooved central portion 23 of the shaft. Due to the presence of the countersink 50 and the bore 50 ', these ends are then retracted into the flanges 5 and 5'. In this way, the end plates of the stacks can not escape from the grooved central portion 23 of the shaft. This is particularly advantageous during the assembly of the rotor.
- Weights can also be attached to the flanges to perfect the static and dynamic balancing of the rotor.
- balancing weights have the form of grub screw 101 that is positioned in threaded holes 102 in the flanges.
- the holes are located as here opposite the magnets 4 so that the balancing screws can axially tighten the magnets.
- Each flange thus comprises six threaded holes 102 in addition to the six passages 61 for the six tie rods 6.
- balancing weights 103 may be positioned in recesses 104 in the ends 60 of the tie rods.
- the weights may for example be in the form of grub screws adapted to threads made in the recesses of the tie rods or even in the screw heads of the tie rods 62.
- the weights are further immobilized by gluing in their threads to ensure the maintenance of their axial position.
- the figures also show tie rods 6 and tie rods 62 specific.
- the heads of the tie rods are pressed into one of the flanges (here on the right side of the figure) and are simply stopped by a rod 63 cooperating with a shoulder 64 of the flange.
- Tie screws 62 are screws whose countersunk heads are retracted into the thickness of the flange (left in the figure).
- This design allows on the one hand to reduce the axial size of the rotor and on the other hand to obtain substantially smooth flanges and therefore little noise generators.
- the central opening of the intermediate flange 7 of the rotor of Figure 6 is circular, that is to say that it does not transmit rotational force to the shaft.
- the entire torque is transmitted to the shaft by the projections 34 of the plates since all the flanges (lateral and intermediate) are slidably mounted in rotation on the shaft.
- the configuration shown in Figure 1 in which the intermediate flanges also comprises tenons can be chosen, however, to further facilitate the transmission of torque and the alignment of the passages 61 for the tie rods during the assembly of the rotor.
- the rotor according to the invention without damage supports very high speeds of rotation, much higher than 10 000 rpm, namely speeds of the order of 20 000 rpm at least.
- the high resistance to centrifugation of the rotor according to the invention makes it possible to further reduce the gap, that is to say the radial distance between the rotor and the stator of the electric machine, to about 0.2 - 0.3 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0855634A FR2935206B1 (fr) | 2008-08-20 | 2008-08-20 | Rotor interieur pour machine electrique a cales d'aimants en forme de "t" |
| PCT/EP2009/005456 WO2010020335A2 (fr) | 2008-08-20 | 2009-07-28 | Rotor interieur pour machine electrique tournante a cales d'aimants en forme de << t >> |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2313958A2 true EP2313958A2 (fr) | 2011-04-27 |
| EP2313958B1 EP2313958B1 (fr) | 2013-12-18 |
Family
ID=40419019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09777487.1A Not-in-force EP2313958B1 (fr) | 2008-08-20 | 2009-07-28 | Rotor interieur pour machine electrique tournante a cales d'aimants en forme de <<t>> |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20110204740A1 (fr) |
| EP (1) | EP2313958B1 (fr) |
| JP (1) | JP5793078B2 (fr) |
| CN (1) | CN102124633B (fr) |
| FR (1) | FR2935206B1 (fr) |
| WO (1) | WO2010020335A2 (fr) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101880097B1 (ko) * | 2012-01-19 | 2018-07-23 | 삼성전자주식회사 | 모터와 그 로터 |
| WO2014032725A1 (fr) * | 2012-08-31 | 2014-03-06 | The Switch Drive Systems Oy | Rotor d'une machine électrique à aimants permanents |
| WO2014082840A2 (fr) * | 2012-11-30 | 2014-06-05 | Arcelik Anonim Sirketi | Rotor à aimant permanent à ailettes |
| WO2014082839A2 (fr) | 2012-11-30 | 2014-06-05 | Arcelik Anonim Sirketi | Rotor à aimant permanent à ailettes |
| US10069357B2 (en) | 2012-11-30 | 2018-09-04 | Arcelik Anonim Sirketi | Spoke permanent magnet rotor |
| US20140265717A1 (en) * | 2013-03-15 | 2014-09-18 | Ingersoll-Rand Company | High speed induction electrical machine |
| KR20140140185A (ko) * | 2013-05-28 | 2014-12-09 | 삼성전자주식회사 | 모터 |
| FR3006824B1 (fr) * | 2013-06-05 | 2016-12-23 | Valeo Equip Electr Moteur | Rotor de machine electrique tournante et machine electrique tournante comprenant un tel rotor |
| FR3018146A1 (fr) | 2014-03-03 | 2015-09-04 | Michelin & Cie | Rotor pour machine electrique tournante comprenant des moyens de precontrainte d'aimants, et procede de montage associe |
Family Cites Families (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1317744A (fr) * | 1963-05-08 | |||
| US2255477A (en) * | 1938-10-06 | 1941-09-09 | Bendix Aviat Corp | Rotor |
| FR2525830A1 (fr) * | 1982-04-23 | 1983-10-28 | Renault | Machine electrodynamique refroidie par un liquide |
| JPS59230454A (ja) * | 1983-06-10 | 1984-12-25 | Fanuc Ltd | 永久磁石界磁回転子の製造方法 |
| US4700096A (en) * | 1985-02-28 | 1987-10-13 | Auxilec | High speed synchronous machine having a rotor provided with magnets arranged for orthoradial magnetic induction |
| US4710663A (en) * | 1986-12-12 | 1987-12-01 | Westinghouse Electric Corp. | Dynamoelectric machine coil slot wedge mounting arrangement |
| JPH02241339A (ja) * | 1989-03-14 | 1990-09-26 | Hitachi Ltd | ターボチャージヤ直結回転機用永久磁石回転子 |
| JPH0332333A (ja) * | 1989-06-26 | 1991-02-12 | Fanuc Ltd | ラジアルタイプのロータ構造 |
| FR2655784B1 (fr) * | 1989-12-08 | 1992-01-24 | Alsthom Gec | Moteur a aimants a concentration de flux. |
| US6259180B1 (en) * | 1996-07-02 | 2001-07-10 | Schlenker Enterprises, Ltd. | Motor including embedded permanent magnet rotor and method for making the same |
| FI970943A7 (fi) * | 1997-03-05 | 1998-09-06 | Rotatek Finland Oy | Menetelmä ja laite magneettivuon muokkaamiseksi |
| US5952755A (en) * | 1997-03-18 | 1999-09-14 | Electric Boat Corporation | Permanent magnet motor rotor |
| DE19737391A1 (de) * | 1997-08-27 | 1999-03-04 | Magnet Motor Gmbh | Elektrische Maschine, deren Rotor aus Dauermagneten und Magnetfluß-Leitstücken aufgebaut ist |
| DE69930040T2 (de) * | 1998-11-13 | 2006-10-26 | Conception et Dévelopement Michelin | Elektrische Maschine mit insbesondere für hohe Geschwindigkeiten angepasstem Rotor |
| US6697420B1 (en) * | 1999-05-25 | 2004-02-24 | Intel Corporation | Symbol-based signaling for an electromagnetically-coupled bus system |
| TW513841B (en) * | 2000-04-04 | 2002-12-11 | Bosch Gmbh Robert | Rotor |
| DE10216856B4 (de) * | 2002-04-16 | 2005-06-09 | Siemens Ag | Sicherung der Bandage eines permanentmagneterregten Läufers für eine elektrische Maschine |
| FR2839211A1 (fr) * | 2002-04-29 | 2003-10-31 | Conception & Dev Michelin Sa | Machine electrique dont le rotor est specialement adapte aux hautes vitesses |
| FR2852162B1 (fr) * | 2003-03-06 | 2005-09-23 | Leroy Somer Moteurs | Machine electrique tournante comportant un stator et deux rotors |
| JP4400425B2 (ja) * | 2004-11-15 | 2010-01-20 | トヨタ自動車株式会社 | 表面磁石型電動機、表面磁石型電動機の製造方法、および表面磁石型電動機を備えた内燃機関 |
| CN1750362A (zh) * | 2005-04-27 | 2006-03-22 | 衣广津 | 电动机发电机槽口封条 |
| JP4834401B2 (ja) * | 2005-12-28 | 2011-12-14 | 株式会社東芝 | 回転電機ロータのき裂除去方法、回転電機ロータおよび回転電機 |
| DE102006049825B4 (de) * | 2006-10-21 | 2012-10-25 | Esw Gmbh | Anordnung zur Befestigung von Permanentmagneten an schnell drehenden Rotoren von elektrischen Maschinen |
-
2008
- 2008-08-20 FR FR0855634A patent/FR2935206B1/fr not_active Expired - Fee Related
-
2009
- 2009-07-28 JP JP2011523326A patent/JP5793078B2/ja not_active Expired - Fee Related
- 2009-07-28 EP EP09777487.1A patent/EP2313958B1/fr not_active Not-in-force
- 2009-07-28 WO PCT/EP2009/005456 patent/WO2010020335A2/fr not_active Ceased
- 2009-07-28 CN CN200980132377XA patent/CN102124633B/zh not_active Expired - Fee Related
- 2009-07-28 US US13/059,735 patent/US20110204740A1/en not_active Abandoned
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2010020335A3 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2313958B1 (fr) | 2013-12-18 |
| FR2935206A1 (fr) | 2010-02-26 |
| US20110204740A1 (en) | 2011-08-25 |
| WO2010020335A3 (fr) | 2010-04-15 |
| FR2935206B1 (fr) | 2010-10-08 |
| JP2012500614A (ja) | 2012-01-05 |
| CN102124633A (zh) | 2011-07-13 |
| WO2010020335A2 (fr) | 2010-02-25 |
| JP5793078B2 (ja) | 2015-10-14 |
| CN102124633B (zh) | 2013-11-06 |
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